Aspirator arrangement



. A. GULICK ASPIRATOR ARRANGMENT Aug. l5, 1939.

Filed May 25, 1958 mm w f Patented Aug. 15, 1939 UNITED STATES ATENT orina ASPIRATOR ARRANGEMENT Application May 25, 193s, semi- No. 209,876

6 Claims.

This invention relates to an impro-ved aspirator assembly and more particularly to an improved nozzle-mounting arrangement for such an assemb-ly. In some respects the present invention provides a further development of or an impro-vement upon the nozzle-mounting arrangements disclosed in the United States patent to Lyman F. Whitney No. 1,710,910, dated April 30, 1929, and Wescott Patent No. 1,694,087, dated December 4, 1928.

The arrangement disclosed herein may also be employed to particular advantage with aspirator assemblies of the type disclosed in the copending application Serial No. 177,7 49 of Lyman F. Whitney, iiled December 2, 1937.

As disclosed in the above-identified Wescott patent, it is highly desirable to arrange an aspirator nozzle so that it may be accurately aligned with the aspirator funnel. For this purpose the dome or the mixing chamber through which the nozzle extends may be distortable to permit the convenient .alignment of the nozzle with the funnel.

In accordance with this invention, a suitable rod may extend from the nozzle to a supporting bracket, the rod being so arranged that the nozzle when once adjusted may be properly held in alignment by the bracket. For this purpose, as disclosed in the copending application of Lyman F. Whitney led on even date herewith, I prefer to employ a bracket of U-shaped form extending from the opposite sides of the mixing chamber to a region spaced from the dome of the same, the bight portion of the U-shaped bracket being disposed in this region and supporting one end of the rod.

The rod may conveniently be formed in two parts, one of which is adapted to engage the bight portion of the bracket. The opposite end of the rod may conveniently be received in a plug associated with the nozzle. The rod preferably extends through an opening in the bight portion of the bracket, which is somewhat larger than the rod, the latter being secured to the bracket accurately to ix the position of the nozzle only after the latter has been accuratly aligned with the funnel.

The alignment of the nozzle with the funnel is facilitated by the provision of a thin, somewhat distortable dome for the mixing chamber, which permits the position of the nozzle slightly to be changed after the various parts of the aspirator have been assembled. For this purpose an aligning bar may be provided with a tapered end portion to t-the nozzle, and may be inserted through the funnel so that itsI end portion `fits the nozzle to bring the latter into accurate alignment with the funnel. Thereupon, the other end of the rod may be secured in fixed position by welding or brazing.

Preferably the rod may be formed in. two parts which have a tight sliding engagement with each other, one of these parts being xed to the nozzle assembly and the other being xed to the bracket.

In the accompanying drawing:

Fig. 1 is a sectional View of an aspirator as'- sembly having a nozzle-mounting arrangement in accordance with this invention;

Fig. 2 is an enlarged view of the mixing chamber and nozzle-mounting arrangement on a plane at right angles to that of Fig. l; and

Fig. 3 is an end elevation of the aspirator assembly showing the nozzle-mounting arrangement.

The accompanying drawing shows an aspirator assembly of the general character disclosed in the above-identified copending application. of Lyman F. Whitney. Such an assembly comprises a funnel l with a throat 2 and with a cooling jacket 3. If desired, the funnel may be provided with a plurality of lns l disposed within the cooling jacket. The assembly is also provided with a mixing chamber 5 which receives vapor from .a supply duct 6. The mixing chamber 5 is' pro-vided with a dished end wall or dome 1, thro-ugh which the nozzle 8 may extend. The dome 1 may be of thin metal of low heat conductivity, such as nichrome or stainless steel, and

may be capable of being distorted slightly to permit adjustment of the angular position of the nozzle 8.

' The nozzle 8, as sho-wn in Fig. 2, is arranged to receive propellant vapor through a tube 9. The connection between the nozzle and tube 9 is provided with a short tubular extension I0 extending away from, the nozzle. Bars ll preferably are welded to the head 5 of thenozzle and extend outwardly from opposite sides thereof to afford supports for the opposite sides of a U- shaped bracket I2. This bracket may be provided by bending a suitable steel channel into a U-shaped form, as shown. This channel preferably is provided with openings I3 of substantial diameter rto impede the flow of heat from the head to the bight portion of the bracket.

The intermediate part of the bight portion o-f the bracket is provided with a central opening vIii. A rod I'I formed of metal of low heat conductivity, such as nichrome or stainless steel, ex-

tends between the nozzle assembly and the bight portion of the bracket. Preferably the rod l1 may be considered as being formed in two parts, namely, the rod proper Ila and a button I'lb in which the end of the rod proper ts with a tight sliding t. The button has a portion of reduced diameter extending through the opening I6, and a head portion adapted to engage the outer surface of the bight portion of bracket I2. It will be understood that both the button Hb and the rod proper Ila are preferably formed of metal of low heat conductivity. 'I'he inner end of rod V121 preferably is Welded to a metal plug I9, which nts within and is welded to the short tubular extension In of the nozzle assembly.

When the parts are first assembled they may be arranged in the manner which has been described, it being noted that the opening I6 is somewhat larger than the corresponding portion of the bushing I'Ib which extends therethrough,

so that the angular position of the rod l'l is then only approximately determined. After the parts have been assembled in this manner, a suitable aligning bar having a tapered end to t the nozzle- 8, is inserted through the funnel l, this bar being adapted closely to fit the bore of the funnel and have its end firmly engaging the tapered nozzle 8. Thus the bar is effective in bringing the nozzle into accurate alignment with the funnel. Such movement of the nozzle is permitted since the dome 'l is of thin, distortable metal, and since the outer end of rod il is not yet xed but is free to move due to the size ci the opening I6.

After the nozzle is brought into accurate alignment with the funnel in this manner, the enlarged portion of the button or bushing Hb may be secured to the bight portion of the bracket i2 by brazil-ig 2D, thus accurately to hold the nozzle assembly in place 'so that the nozzle 8 is maintained in alignment with the funnel.

It is evident that the present invention affords a simple and effective arrangement for supporting and accurately holding an aspirator nozzle `in alignment with an aspirator funnel, and that such an arrangement also permits the convenient adjustment of the position of the aspirator nozzle so that it may readily be brought into proper alignment. It is furthermore evident that the arrangement of the two-part rod l1 affords means permitting relative movement of the nozzle and the bracket due to heat expansion While still causing the nozzle to be held in accurate alignment with the funnel.

It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modiiications and equivalents which fall within the scope of the appended claims.

I claim:

1. An aspirator assembly comprising a mixing chamber, a funnel extending from the mixing chamber, a duct to supply fluid to the mixing chamber, said mixing chamber having an end wall, a nozzle secured to said wall in alignment with the funnel, a duct for supplying vapor to said nozzle, a rod extending from said nozzle, a bracket extending from said mixing chamber and'having a portion remote therefrom, said rod having a part in loose intertting relation with said remote portion of the bracket to determine the approximate alignment of the nozzle and funnel, and means whereby the rod is xed to the bracket after accurate alignment of the nozzle with the funnel.

2. An aspirator assembly according to claim 1, wherein the rod is formed in two parts, one of which is fixed to the bracket and the other of which is fixed to the funnel, said parts having a sliding t to permit relative movement of the nozzle and the remote portion of the bracket as a result of heat expansion.

3. An aspirator assembly comprising a mixing chamber, a funnel extending from the mixing chamber, a duct to supply fluid to the mixing chamber, said mixing chamber having an end wall, a nozzle secured to said wall in alignment With the funnel, a duct for supplying vapor to said nozzle, a rod extending from said nozzle in alignment with the nozzle, a bracket extending from said mixing chamber and having a portion remote therefrom, said portion of the bracket providing an opening through which a portion of the rod extends, said opening having a larger diameter than the corresponding portion of the rod to permit slight movement of the nozzle and rod upon assembly of the aspirator, and means whereby the rod is xed to said remote portion of the bracket.

4. Aspirator assembly of the class described comprising a funnel, a mixing chamber, a duct for supplying vapor to said mixing chamber, said mixing chamber having an end wal1,'a nozzle secured to said end wall in alignmentwith' the funnel, a rod secured to said nozzle and extending in alignment with the funnel away from the wall, a U-shaped bracket extending from the mixing chamber and having a bight portion with an opening through which the rod extends, said opening being, somewhat larger than the corresponding part of the rod to permit adjustment of the angular position of the rod and the nozzle, and means securing the rod to the bracket after the nozzle has been moved into alignment with the funnel.

5. Aspirator assembly of the class described comprising a funnel, a mixing chamber, a duct for supplying vapor to said chamber, said mixing chamber having an end wall, an aspirator nozzle extending through said wall, a bracket secured to the mixing chamber and having a portion remote therefrom, a two-part rod extending between the nozzle and said portion of the bracket, the parts of said rod having a sliding nt with each other, one of the parts of the rod being iixed to the nozzle, the other part of the rod extending through an opening in said portion of the bracket, said opening having a diameter slightly greater than that of the corresponding part of the rod thereby to determine the approximate angular position of the rod and nozzle, and means securing the rod to the bracket accurately to determine the angular position of the rod and nozzle.

6. Aspirator assembly of the class described comprising a funnel, a mixing chamber, a duct for supplying vapor to said chamber, said mixing chamber having an end wall, an aspirator nozzle extending through said wall, a bracket secured to the mixing chamber and having a portion remote therefrom, a two-part rod extending in alignment with the funnel between the nozzle and said portion of the bracket, the parts of said rod having a sliding fit with each other, one of the parts of the rod being xed to the nozzle, the other part of the rod being xed to said remote portion of the bracket.

RUSSELL A. GULICK. 

